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net: Untangle nested qemu_send_packet (Jan Kiszka)
Queue packets that are send during an ongoing packet delivery. This ensures that packets will always arrive in their logical order at each client of a VLAN. Currently, slirp generates such immediate relies, and e.g. packet-sniffing clients on the same VLAN may get confused. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7203 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
parent
a66b11bfcd
commit
764a4d1deb
36
net.c
36
net.c
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@ -403,22 +403,46 @@ int qemu_can_send_packet(VLANClientState *vc1)
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return 0;
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}
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void qemu_send_packet(VLANClientState *vc1, const uint8_t *buf, int size)
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static void
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qemu_deliver_packet(VLANClientState *sender, const uint8_t *buf, int size)
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{
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VLANState *vlan = vc1->vlan;
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VLANClientState *vc;
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if (vc1->link_down)
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for (vc = sender->vlan->first_client; vc != NULL; vc = vc->next) {
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if (vc != sender && !vc->link_down) {
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vc->fd_read(vc->opaque, buf, size);
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}
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}
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}
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void qemu_send_packet(VLANClientState *vc, const uint8_t *buf, int size)
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{
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VLANState *vlan = vc->vlan;
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VLANPacket *packet;
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if (vc->link_down)
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return;
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#ifdef DEBUG_NET
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printf("vlan %d send:\n", vlan->id);
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hex_dump(stdout, buf, size);
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#endif
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for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
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if (vc != vc1 && !vc->link_down) {
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vc->fd_read(vc->opaque, buf, size);
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if (vlan->delivering) {
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packet = qemu_malloc(sizeof(VLANPacket) + size);
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packet->next = vlan->send_queue;
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packet->sender = vc;
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packet->size = size;
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memcpy(packet->data, buf, size);
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vlan->send_queue = packet;
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} else {
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vlan->delivering = 1;
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qemu_deliver_packet(vc, buf, size);
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while ((packet = vlan->send_queue) != NULL) {
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qemu_deliver_packet(packet->sender, packet->data, packet->size);
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vlan->send_queue = packet->next;
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qemu_free(packet);
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}
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vlan->delivering = 0;
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}
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}
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11
net.h
11
net.h
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@ -29,11 +29,22 @@ struct VLANClientState {
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char info_str[256];
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};
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typedef struct VLANPacket VLANPacket;
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struct VLANPacket {
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struct VLANPacket *next;
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VLANClientState *sender;
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int size;
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uint8_t data[0];
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};
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struct VLANState {
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int id;
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VLANClientState *first_client;
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struct VLANState *next;
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unsigned int nb_guest_devs, nb_host_devs;
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VLANPacket *send_queue;
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int delivering;
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};
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VLANState *qemu_find_vlan(int id);
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